綜合研究硫化動力學和過渡金屬離子吸附以增強 CdSe(en)0.5奈米片的 HER 性能：深入分析中孔結構變化和自由基形成
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2024
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在我們的研究中，我們全面研究了 CdSe(en)0.5 奈米片在不同條件下的硫化動力學，強調了不同硫前驅物(硫化鈉/亞硫酸鈉；硫粉) 和氣氛 (氮氣；大氣) 的影響。我們透過柯肯德爾效應的角度，使用高解析度透射電子顯微鏡(HR-TEM)和能量色散 X 射線光譜（EDS）映射等先進技術，仔細分析材料的微觀結構，以了解形態變化和元素分佈。X 射線繞射（XRD）、EA-ICP 和元素分析證實了晶體結構和化學成分 (N:Se:S) 的變化，並利用氣相層析阻擋放電離子偵測器（GC-BID）發現不同硫化條件下的材料其光催化水分解析氫的顯著變化。電子順磁共振（EPR）分析進一步強調了氮氫自由基在催化過程中的關鍵作用，以及硫化後材料對環境敏感度變化，為了解硫化對自由基形成的影響提供了見解。此外，我們關於形成各向異性介孔結構的發現為利用過渡金屬離子的化學吸附提高催化效率開闢了新途徑，並有望在二維半導體光催化方面取得進展。
In our study, we comprehensively investigated the sulfidation kinetics of CdSe(en)0.5 nanosheets under different conditions, emphasizing the effects of different sulfur precursors (Na2S/Na2SO3; sulfur powder) and atmospheres (nitrogen; ambient). Through the perspective of the Kirkendall effect, we meticulously analyzed the microstructure of the materials using advanced techniques such as high-resolution transmission electron microscopy (HR-TEM) and energy-dispersive X-ray spectroscopy (EDS) mapping to understand morphological changes and elemental distribution. X-ray diffraction (XRD), EA-ICP, and elemental analysis confirmed the changes in crystal structure and chemical composition (N:Se:S), and gas chromatography-barrier ionization discharge (GC-BID) revealed significant changes in the photocatalytic hydrogen evolution from water splitting under differentsulfidation conditions. Electron paramagnetic resonance (EPR) analysis further emphasized the critical role of nitrogen-hydrogen radicals in the catalytic process and the changes in environmental sensitivity of the material after sulfidation, providing insights into the effect of sulfidation on radical formation. Additionally, our findings on the formation of anisotropic mesoporous structures open up new avenues for enhancing catalytic efficiency through the chemical adsorption of transition metal ions, promising advancements in two-dimensional semiconductor photocatalysis.
In our study, we comprehensively investigated the sulfidation kinetics of CdSe(en)0.5 nanosheets under different conditions, emphasizing the effects of different sulfur precursors (Na2S/Na2SO3; sulfur powder) and atmospheres (nitrogen; ambient). Through the perspective of the Kirkendall effect, we meticulously analyzed the microstructure of the materials using advanced techniques such as high-resolution transmission electron microscopy (HR-TEM) and energy-dispersive X-ray spectroscopy (EDS) mapping to understand morphological changes and elemental distribution. X-ray diffraction (XRD), EA-ICP, and elemental analysis confirmed the changes in crystal structure and chemical composition (N:Se:S), and gas chromatography-barrier ionization discharge (GC-BID) revealed significant changes in the photocatalytic hydrogen evolution from water splitting under differentsulfidation conditions. Electron paramagnetic resonance (EPR) analysis further emphasized the critical role of nitrogen-hydrogen radicals in the catalytic process and the changes in environmental sensitivity of the material after sulfidation, providing insights into the effect of sulfidation on radical formation. Additionally, our findings on the formation of anisotropic mesoporous structures open up new avenues for enhancing catalytic efficiency through the chemical adsorption of transition metal ions, promising advancements in two-dimensional semiconductor photocatalysis.
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硒化鎘, 硫化鎘, 光催化水分解產氫, 各向異性蝕刻, 硫化, Cadmium Selenide, Cadmium Sulfide, Sulfurization, Photocatalytic Water Splitting, Anisotropic Etching